EP 0802339 A3 19971112 -
Publication
Application
Priority
- JP 9445896 A 19960416
- JP 17575396 A 19960613
Abstract (en)
[origin: EP0802339A2] A bearing retainer (1) having a body (1a) formed of steel has a nitride layer (N) on the body surface. The average particle diameter of a nitride contained in the nitride layer (N) is not more than 1 mu m. The surface of the retainer (1) is subjected to fluoriding treatment, and is then subjected to nitriding treatment. The above-mentioned oxide is removed by replacing an oxide on the surface of the retainer (1) with a metal fluoride film by the fluoriding treatment. In the nitriding treatment, a gaseous mixture of gas for nitriding, for example, ammonia gas and hydrogen gas for removing the metal fluoride film is brought into contact with the surface of the retainer (1). A precise and uniform nitride layer (N) is obtained in a state where the oxide is reliably removed from the surface of the retainer (1). <IMAGE>
IPC 1-7
IPC 8 full level
F16C 33/42 (2006.01); F16C 33/44 (2006.01)
CPC (source: EP US)
F16C 33/427 (2013.01 - EP US); F16C 33/445 (2013.01 - EP US); F16C 19/06 (2013.01 - EP US)
Citation (search report)
- [Y] JP H0649623 A 19940222 - NTN TOYO BEARING CO LTD & PATENT ABSTRACTS OF JAPAN vol. 018, no. 285 (C - 1206) 31 May 1994 (1994-05-31)
- [Y] EP 0408168 A1 19910116 - DAIDO OXYGEN [JP]
- [A] EP 0511409 A1 19921104 - DAIDO OXYGEN [JP]
- [A] EP 0515701 A1 19921202 - DAIDO OXYGEN [JP]
- [A] EP 0516899 A1 19921209 - DAIDO OXYGEN [JP]
- [A] DE 19500576 A1 19950921 - SCHAEFFLER WAELZLAGER KG [DE]
- [A] JP H0754123 A 19950228 - DAIDO HOXAN INC, et al & PATENT ABSTRACTS OF JAPAN vol. 095, no. 005 30 June 1995 (1995-06-30)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0802339 A2 19971022; EP 0802339 A3 19971112; EP 0802339 B1 20090617; DE 69739454 D1 20090730; JP H102336 A 19980106; US 5833373 A 19981110
DOCDB simple family (application)
EP 97106112 A 19970414; DE 69739454 T 19970414; JP 17575396 A 19960613; US 84076497 A 19970416